A structural additive optimization method and its application in vibration reduction of helicopter rotor systems

Abstract

This study presents a structural additive optimization method designed to reduce vibrations in complex dynamic systems. Conventional optimization techniques, such as topology, shape, and sizing optimization, often encounter difficulties in addressing dynamic loading and manufacturing constraints. To address these challenges, the proposed method introduces targeted material addition at structural points with maximum dynamic displacement, thereby increasing stiffness and mitigating vibrations. The method's effectiveness is demonstrated through its application to a helicopter rotor system, which is characterized by intricate dynamic responses and operational complexities. Finite element modeling, transient dynamic analysis, and iterative optimization are employed to validate the approach. The results show a maximum displacement reduction of 41.01 %, indicating substantial improvements in structural stiffness and vibration suppression, while achieving this outcome with markedly lower computational cost compared to conventional size optimization methods. This research underscores the feasibility and adaptability of structural additive optimization under varying operational loads, offering a robust alternative to traditional methods. The findings have practical implications for vibration-sensitive engineering systems in which dynamic performance and structural integrity are paramount.